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Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©
Page 24 www.PressureSystems.com
2.3.4.4 PURGE Mode Inputs
9816 scanners are supplied with a purge/leak-charge feature. The purge feature allows users to
apply positive pressure to the PURGE input which will then be vented out of the user input
ports, forcing contaminants (such as moisture) out of the pneumatic input lines. (Note: on
common reference 9816 scanners, only the numbered input ports will be purged. RUN
REF is not purged). True differential 9816 scanners will purge both the run and reference input
ports for all channels. The purge supply provided to the 9816 must always be a higher pressure
than the highest pressure present on the input ports of the module. The purge supply must also
be capable of maintaining proper purge pressure at the high flow rates encountered while the
module is in the purge mode.
When commanded into the PURGE position, the purge input pressure will be connected to the
numbered measurement input ports allowing for a flow of air away from the instrument. The
purge cycle should be terminated by commanding the 9816 into a non-purge mode, such as
CAL.
Figure 2.6
WARNING: Failure to provide proper purge supply pressure may result in
migration of moisture and contaminants into the 9816 module. This
can result in permanent damage to module components.
WARNING: Purge cycles should NEVER be terminated by turning off the purge
supply air while in the PURGE position.